CN109652677A - A kind of method fine grain synusia tissue T iAl sheet alloy and directly prepare it - Google Patents
A kind of method fine grain synusia tissue T iAl sheet alloy and directly prepare it Download PDFInfo
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- CN109652677A CN109652677A CN201910065038.XA CN201910065038A CN109652677A CN 109652677 A CN109652677 A CN 109652677A CN 201910065038 A CN201910065038 A CN 201910065038A CN 109652677 A CN109652677 A CN 109652677A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
A kind of method for the present invention provides fine grain synusia tissue T iAl sheet alloy and directly preparing it, the fine grain synusia tissue T iAl sheet alloy, each element including following atom percentage content: 43-46%Al, 1-8%x, 0.1-0.5%y, surplus Ti；Wherein the x is the mixing of one or more of Mo, Cr, Nb and Mn；Y is the mixing of one or more of B, C and Y.The present invention controls Al and alloying element additive amount is prepared the TiAl alloy plate with tiny lamellar microstructure, eliminated subsequent heat treatment, reduce process by direct pack rolling by the ingredient of regulation TiAl alloy.Meanwhile prepared TiAl alloy plate fine microstructures are uniform, and are practically free of brittleness β0Phase, while having had both intensity and plasticity.It provides that process flow is simple, high performance TiAl alloy hot-working preparation method, is conducive to promotion and application.
Description
Technical field
The invention belongs to the milling method of TiAl alloy plate, in particular to a kind of fine grain synusia tissue T iAl sheet alloy
And the method for directly preparing it.
Background technique
TiAl alloy has high specific strength, high specific stiffness, excellent inoxidizability and creep resistance, and is higher than conventional titanium
A kind of anti-flammability of alloy, it is considered to be high-temperature structural material in 650 DEG C -900 DEG C great application prospects.TiAl alloy plate
It is the candidate materials of current American primary means air plan, these plans fly including reusable carrier rocket, NASA future X
Machine, joint action machine, X-38 relief car, military space plane, maneuverable spacecraft and supersonic aircraft.In addition, TiAl alloy
Plate is ideal body structure skin material.But there are still sizable in terms of plant-scale sheet fabrication for TiAl alloy
Technological difficulties.Such alloy there are intrinsic brittleness, heat deformability is poor, hot processing window is narrow, resistance of deformation is big and synusia colony
The disadvantages of coarse, increases the preparation difficulty of TiAl alloy plate.
TiAl alloy with fine uniform lamellar microstructure has excellent comprehensive mechanical property.In order to obtain this kind of group
It knits, the researcher that the country is crossed has done numerous studies, and it is main by the methods of addition alloying element, heat treatment, hot extrusion, but
The average grain size of synusia colony obtained is still very big, is far from satisfying industrial requirement.In order to improve TiAl alloy
Hot-working character, improve the formability of TiAl alloy, by add β phase stable element introduced into alloy high-temp tissue it is unordered
β phase is a kind of effective method.Hot deformation behavior is the study found that deformation and dynamic recrystallization preferentially produce in the β phase of grain boundaries
It is raw.The presence of β phase promotes the sliding of crystal grain and the migration of crystal boundary, improves deformability.But β phase can ordering in low temperature
For the β of B2 structure0Phase, orderly β0Mutually belong to hard crisp phase, is unfavorable for TiAl alloy temperature-room type plasticity.β in room temperature texture0Mutually not only
It is difficult to completely eliminate by subsequent heat treatment, and heat treatment process also will cause grain coarsening, damage alloy mechanical property.
And the introducing of β phase, it will weaken the croop property of material itself.In addition to this, preparation TiAl alloy plate still remains pair
Equipment requirement and it is at high cost, the process-cycle is long, stock utilization is low, large-scale sheet difficult forming the deficiencies of, seriously constrain
The practicalization of TiAl alloy.
Studies have shown that unordered α phase can also significantly improve the deformability of TiAl alloy, especially equiaxial α crystal grain.This
Invention controls Al and alloying element additive amount is directly prepared by direct pack rolling by the ingredient of regulation TiAl alloy
TiAl alloy plate with tiny lamellar microstructure, eliminates subsequent heat treatment, reduces process.Meanwhile it is prepared
TiAl alloy plate fine microstructures are uniform, and are practically free of brittleness β0Phase, while having had both intensity and plasticity.Provide technique
Process is simple, high performance TiAl alloy hot-working preparation method, is conducive to promotion and application.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of fine grain synusia tissue T iAl sheet alloy and directly prepare
Its method controls Al and alloying element additive amount, by direct pack rolling, directly by regulating and controlling the ingredient of TiAl alloy
The TiAl alloy plate with tiny lamellar microstructure is prepared, subsequent heat treatment is eliminated, reduces process.Meanwhile it is made
Standby TiAl alloy plate fine microstructures are uniform, and are practically free of brittleness β0Phase, while having had both intensity and plasticity.It provides
Process flow is simple, high performance TiAl alloy hot-working preparation method, is conducive to promotion and application.
The purpose of the present invention is what is be achieved through the following technical solutions:
The present invention provides a kind of fine grain synusia tissue T iAl sheet alloy, each member including following atom percentage content
Element: 43-46%Al, 1-8%x, 0.1-0.5%y, surplus Ti；Wherein the x is Mo, Cr, one or more of Nb and Mn
Mixing；Y is the mixing of one or more of B, C and Y.
Preferably, each element including following atom percentage content: 43.5-45.5%Al, 4-8%x, 0.2-0.3%
Y, surplus Ti；Wherein the x is the mixing of one or more of Mo, Cr, Nb and Mn；Y is B, one of C and Y or several
The mixing of kind.
Preferably, the x is the mixing of one or both of Cr and Nb；Y is the mixing of one or both of C, Y,
Or y is the mixing of C and/or Y and B.
Preferably, the TiAl alloy includes Ti-43Al-1.5Cr-0.2Y, Ti-43Al-4Nb-0.5Mo-0.2C, Ti-
43Al-4Nb-1.5Cr-0.2B、Ti-43Al-2Nb-2Cr-0.3Y、Ti-43.5Al-2Nb-2Cr-0.2B-0.3Y、Ti-
43.5Al-2Nb-1.5Cr-0.3C、Ti-43Al-4Nb-2Mn-0.3Y、Ti-44Al-7Nb-0.2Y、Ti-44Al-1Cr-0.3C、
Ti-44Al-2Mn-0.2C、Ti-44Al-4Nb-0.4Mo-0.2C、Ti-45Al-2Cr-2Nb、Ti-45Al-2Cr-2Nb-0.2Y、
Ti-45Al-4Nb-1Cr-0.2Y、Ti-45Al-3Nb-2Mn-1Cr-0.1Y-0.1C、Ti-46Al-8Nb-0.1B-0.1C-
0.2Y, Ti-46Al-4Nb-1Mo-0.1B-0.1C or Ti-46Al-3Mn-1Mo-0.1B.
The present invention also provides a kind of methods for directly preparing fine grain synusia tissue T iAl sheet alloy, including following step
It is rapid:
A, the preparation of TiAl alloy slab；
B, by TiAl alloy slab jacket；
C, the TiAl alloy slab after jacket is subjected to pack rolling early period；
D, the TiAl alloy slab after pack rolling early period is subjected to later period pack rolling；
E, the jacket TiAl alloy plate for obtaining step D carries out stress relief annealing and jacket releases to get the fine grain
Lamellar microstructure TiAl alloy plate.
Preferably, in step A, the TiAl alloy slab with a thickness of 10mm-50mm；
Preferably, in step A, the TiAl alloy slab can be powder metallurgic method or ingot metallurgy method preparation, tool
The method of body can for pre-alloyed powder+hot isostatic pressing, pre-alloyed powder+vacuum heating-press sintering, the melting of plasma beam cold hearth,
Plasma beam cold hearth melting+canned forging, vacuum arc melting, vacuum arc melting+canned forging, scull induction melting,
The preparation of the methods of scull induction melting+canned forging.
Preferably, in step A, the average grain size or average layer piece colony of gained TiAl alloy slab having a size of 5 μm-
300μm。
Preferably, in step B, the method by TiAl alloy slab jacket is specifically includes the following steps: TiAl is closed
The polishing of golden steel slab surface is bright and clean, is then placed into two reeded jackets of tool, then by two reeded jackets of tool into
Row welding, obtains the TiAl alloy slab with jacket；
The jacket with a thickness of 5mm-20mm；The jacket material is stainless steel, heat resisting steel or carbon steel.
Preferably, in step C, the design parameter of pack rolling early period includes: that rolling temperature is 1255 DEG C -1360
DEG C, stokehold heat preservation 10min-40min, mill speed 20mm/s-120mm/s, pass deformation 18%-40%, passage return
Furnace soaking time is 5min-12min, overall reduction 40%-70%；
In step D, the design parameter of the later period pack rolling includes: that rolling temperature is protected for 1255 DEG C -1360 DEG C, stokehold
Warm 2min-10min, mill speed 50mm/s-200mm/s, pass deformation 15%-35%, passage melt down soaking time
For 2min-10min, overall reduction 60%-90%.
Preferably, the design parameter of pack rolling early period includes: that rolling temperature is protected for 1260 DEG C -1350 DEG C, stokehold
Warm 10min-30min, mill speed 30mm/s-60mm/s, pass deformation 25%-35%, passage melt down soaking time
For 5min-10min, overall reduction 45%-65%；
The design parameter of the later period pack rolling include: rolling temperature be 1260 DEG C -1345 DEG C, stokehold keep the temperature 8min-
It is 4min- that 12min, mill speed 50mm/s-100mm/s, pass deformation 20%-25%, passage, which melt down soaking time,
8min, overall reduction 70%-85%.
Preferably, in step E, the condition of the annealing are as follows: will be in temperature through step D treated TiAl alloy slab
6h-48h is kept the temperature under conditions of 800 DEG C -900 DEG C, then cools to room temperature with the furnace.
Preferably, in step E, jacket is removed using the method for machining, obtains that surface quality is good, fine grain synusia group
The TiAl alloy plate knitted.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, the α phase in high temperature microstructure is a kind of unordered phase, has excellent deformability.The rolling temperature that the present invention selects
Degree ensure that containing a large amount of isometric α crystal grain in high temperature microstructure, while big pass deformation has sufficiently promoted isometric α crystal grain to more
The small isometric α crystal grain transformation of refinement.γ synusia, shape can be precipitated in rolling temperature-fall period in these more tiny isometric α crystal grain
At tiny synusia colony, conducive to the room temperature and mechanical behavior under high temperature for improving TiAl alloy plate simultaneously.
2, the TiAl alloy ingredient that the present invention designs, avoids occur unordered β phase in high temperature microstructure as far as possible, therefore guarantees
Containing a small amount of or without orderly β in room temperature texture0Phase improves the room-temperature mechanical property and high-temperature mechanics of final plate
Energy.
3, the present invention has directly prepared tiny lamellar microstructure by rolling temperature control and rolling mill practice.It can be to avoid
Later period prepares lamellar microstructure by heat treatment again and causes synusia colony coarse, realizes room temperature tensile properties and drawing by high temperature
The balance of energy.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Embodiment 1:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 30mm, the nominal composition of TiAl alloy is Ti-
43Al-4Nb-1.5Cr-0.2B (at.%)；
TiAl alloy slab described in step 1 is prepared by vacuum arc melting+canned forging.
The average grain size of TiAl alloy slab described in step 1 is 70 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 12mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is stainless steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1275
DEG C furnace in keep the temperature 30min.Mill speed is 30mm/s, to melt down soaking time be 8min for pass deformation 25%, passage, this
The overall reduction of plate is 58% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
6min is kept the temperature in 1275 DEG C of furnace.Mill speed is 60mm/s, pass deformation 20%.Passage melts down soaking time
6min, the overall reduction of plate is 79% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 900
18h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 2:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 25mm, the nominal composition of TiAl alloy is Ti-
43Al-2Nb-2Cr-0.3Y (at.%)；
TiAl alloy slab described in step 1 is prepared by plasma beam cold hearth melting.
The average grain size of TiAl alloy slab described in step 1 is 100 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 8mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is heat resisting steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1270
DEG C furnace in keep the temperature 40min.Mill speed is 40mm/s, to melt down soaking time be 8min for pass deformation 23%, passage, this
The overall reduction of plate is 55% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
6min is kept the temperature in 1275 DEG C of furnace.Mill speed is 65mm/s, pass deformation 18%.Passage melts down soaking time
6min, the overall reduction of plate is 75% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 900
15h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 3:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 20mm, the nominal composition of TiAl alloy is Ti-
43Al-1.5Cr-0.2Y (at.%)；
TiAl alloy slab described in step 1 is prepared by pre-alloyed powder+hot isostatic pressing.
The average grain size of TiAl alloy slab described in step 1 is 20 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 8mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is carbon steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1260
DEG C furnace in keep the temperature 25min.Mill speed is 50mm/s, to melt down soaking time be 8min for pass deformation 28%, passage, this
The overall reduction of plate is 63% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
6min is kept the temperature in 1260 DEG C of furnace.Mill speed is 60mm/s, pass deformation 22%.Passage melts down soaking time
6min, the overall reduction of plate is 78% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 850
12h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 4:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 30mm, the nominal composition of TiAl alloy is Ti-
43.5Al-2Nb-2Cr-0.2B-0.3Y (at.%)；
TiAl alloy slab described in step 1 is vacuum arc melting ingot casting+canned forging preparation.
The average grain size of TiAl alloy slab described in step 1 is 60 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 12mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is heat resisting steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1280
DEG C furnace in keep the temperature 30min.Mill speed is 35mm/s, to melt down soaking time be 7min for pass deformation 30%, passage, this
The overall reduction of plate is 51% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
6min is kept the temperature in 1280 DEG C of furnace.Mill speed is 60mm/s, pass deformation 25%.Passage melts down soaking time
6min, the overall reduction of plate is 73% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 800
12h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 5:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 25mm, the nominal composition of TiAl alloy is Ti-
44Al-7Nb-0.2Y (at.%)；
TiAl alloy slab described in step 1 is by cold hearth melting ingot casting+canned forging.
The average grain size of TiAl alloy slab described in step 1 is 30 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 10mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is carbon steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1290
DEG C furnace in keep the temperature 25min.Mill speed is 40mm/s, to melt down soaking time be 8min for pass deformation 25%, passage, this
The overall reduction of plate is 44% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
10min is kept the temperature in 1290 DEG C of furnace.Mill speed is 60mm/s, pass deformation 25%.Passage melts down soaking time
6min, the overall reduction of plate is 70% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 800
8h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, it is good to obtain surface quality
TiAl alloy plate that is good and being fine grain lamellar microstructure.
Embodiment 6:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 20mm, the nominal composition of TiAl alloy is Ti-
44Al-2Mn-0.2C (at.%)；
TiAl alloy slab described in step 1 is by scull induction melting ingot casting+canned forging.
The average grain size of TiAl alloy slab described in step 1 is 80 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 8mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is stainless steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1280
DEG C furnace in keep the temperature 25min.Mill speed is 40mm/s, to melt down soaking time be 8min for pass deformation 25%, passage, this
The overall reduction of plate is 58% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
10min is kept the temperature in 1280 DEG C of furnace.Mill speed is 55mm/s, pass deformation 20%.Passage melts down soaking time
10min, the overall reduction of plate is 73% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 850
10h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 7:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 25mm, the nominal composition of TiAl alloy is Ti-
45Al-2Cr-2Nb-0.2Y (at.%)；
TiAl alloy slab described in step 1 is prepared by vacuum arc melting.
The average grain size of TiAl alloy slab described in step 1 is 150 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 12mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is heat resisting steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1300
DEG C furnace in keep the temperature 60min.Mill speed is 45mm/s, to melt down soaking time be 8min for pass deformation 18%, passage, this
The overall reduction of plate is 45% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
15min is kept the temperature in 1300 DEG C of furnace.Mill speed is 55mm/s, pass deformation 23%.Passage melts down soaking time
10min, the overall reduction of plate is 75% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 850
12h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 8:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 30mm, the nominal composition of TiAl alloy is Ti-
45Al-3Nb-2Mn-1Cr-0.1Y-0.1C (at.%)；
TiAl alloy slab described in step 1 is prepared by plasma beam cold hearth melting.
The average grain size of TiAl alloy slab described in step 1 is 80 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 12mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is stainless steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1305
DEG C furnace in keep the temperature 40min.Mill speed is 45mm/s, to melt down soaking time be 8min for pass deformation 20%, passage, this
The overall reduction of plate is 49% under technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
12min is kept the temperature in 1305 DEG C of furnace.Mill speed is 55mm/s, pass deformation 25%.Passage melts down soaking time
8min, the overall reduction of plate is 72% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 800
15h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
It well and is the TiAl alloy plate of fine grain lamellar microstructure.
Embodiment 9:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 30mm, the nominal composition of TiAl alloy is Ti-
46Al-8Nb-0.1B-0.1C-0.2Y (at.%)；
TiAl alloy slab described in step 1 is prepared by scull induction melting ingot casting+canned forging.
The average grain size of TiAl alloy slab described in step 1 is 70 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 12mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is stainless steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1310
DEG C furnace in keep the temperature 30min.Mill speed is 40mm/s, to melt down soaking time be 10min for pass deformation 20%, passage,
The overall reduction of plate is 49% under this technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
10min is kept the temperature in 1310 DEG C of furnace.Mill speed is 60mm/s, pass deformation 20%.Passage melts down soaking time
8min, the overall reduction of plate is 80% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 850
10h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
Good TiAl alloy plate.
Embodiment 10:
The present embodiment is a kind of method for directly preparing fine grain synusia tissue T iAl sheet alloy, specifically according to the following steps
It carries out:
One, TiAl alloy slab prepares: preparing the TiAl alloy slab of 20mm, the nominal composition of TiAl alloy is Ti-
46Al-4Nb-1Mo-0.1B-0.1C (at.%)；
TiAl alloy slab described in step 1 is prepared by pre-alloyed powder+hot isostatic pressing.
The average grain size of TiAl alloy slab described in step 1 is 30 μm.
Two, it TiAl alloy slab jacket: is polished using the TiAl alloy steel slab surface that machine-tooled method obtains step 1
It is bright and clean, be then placed into two reeded jackets of tool, jacket with a thickness of 8mm.Two reeded jackets of tool are carried out
Welding obtains the TiAl alloy blank with jacket；
Jacket material described in step 2 is carbon steel.
Three, TiAl alloy pack rolling early period: putting the jacket TiAl alloy blank that step 2 obtains into furnace temperature is 1325
DEG C furnace in keep the temperature 30min.Mill speed is 55mm/s, to melt down soaking time be 10min for pass deformation 26%, passage,
The overall reduction of plate is 46% under this technique.
Four, TiAl alloy later period pack rolling: equally putting the jacket TiAl alloy blank that step 3 obtains into furnace temperature is
10min is kept the temperature in 1320 DEG C of furnace.Mill speed is 80mm/s, pass deformation 22%.Passage melts down soaking time
8min, the overall reduction of plate is 67% under this technique.
Five, stress relief annealing and jacket removal: by the jacket TiAl alloy plate rolled in step 4 temperature be 850
10h is kept the temperature under conditions of DEG C, then cools to room temperature with the furnace.Jacket is removed using the method for machining, obtains surface quality
Good TiAl alloy plate.
Compliance test result:
TiAl alloy made from the various embodiments described above and comparative example with excellent deformability is subjected to room temperature mechanical property
Can, tensile strain rate is 2 × 10-4s-1, result is as shown in table 1 below.
Table 1
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (9)
1. a kind of fine grain synusia tissue T iAl sheet alloy, which is characterized in that each element including following atom percentage content:
43-46%Al, 1-8%x, 0.1-0.5%y, surplus Ti；Wherein the x is one or more of Mo, Cr, Nb and Mn
Mixing；Y is the mixing of one or more of B, C and Y.
2. fine grain synusia tissue T iAl sheet alloy according to claim 1, which is characterized in that including following atomic percent
Than each element of content: 43.5-45.5%Al, 4-8%x, 0.2-0.3%y, surplus Ti；Wherein the x be Mo, Cr, Nb and
The mixing of one or more of Mn；Y is the mixing of one or more of B, C and Y.
3. fine grain synusia tissue T iAl sheet alloy according to claim 1 or 2, which is characterized in that the x is Cr and Nb
One or both of mixing；Y be one or both of C, Y mixing or y be C and/or Y and B mixing.
4. the method according to claim 1 for directly preparing fine grain synusia tissue T iAl sheet alloy, which is characterized in that institute
Stating TiAl alloy includes Ti-43Al-1.5Cr-0.2Y, Ti-43Al-4Nb-0.5Mo-0.2C, Ti-43Al-4Nb-1.5Cr-
0.2B、Ti-43Al-2Nb-2Cr-0.3Y、Ti-43.5Al-2Nb-2Cr-0.2B-0.3Y、Ti-43.5Al-2Nb-1.5Cr-
0.3C、Ti-43Al-4Nb-2Mn-0.3Y、Ti-44Al-7Nb-0.2Y、Ti-44Al-1Cr-0.3C、Ti-44Al-2Mn-0.2C、
Ti-44Al-4Nb-0.4Mo-0.2C、Ti-45Al-2Cr-2Nb、Ti-45Al-2Cr-2Nb-0.2Y、Ti-45Al-4Nb-1Cr-
0.2Y、Ti-45Al-3Nb-2Mn-1Cr-0.1Y-0.1C、Ti-46Al-8Nb-0.1B-0.1C-0.2Y、Ti-46Al-4Nb-
1Mo-0.1B-0.1C or Ti-46Al-3Mn-1Mo-0.1B.
5. a kind of direct preparation method of fine grain synusia tissue T iAl sheet alloy according to claim 1, feature exist
In, comprising the following steps:
A, the preparation of TiAl alloy slab；
B, by TiAl alloy slab jacket；
C, the TiAl alloy slab after jacket is subjected to pack rolling early period；
D, the TiAl alloy slab after pack rolling early period is subjected to later period pack rolling；
E, the jacket TiAl alloy plate for obtaining step D carries out stress relief annealing and jacket releases to get the fine grain synusia
Tissue T iAl sheet alloy.
6. the method according to claim 5 for directly preparing fine grain synusia tissue T iAl sheet alloy, which is characterized in that step
In rapid B, the method by TiAl alloy slab jacket is specifically includes the following steps: by TiAl alloy steel slab surface polishing light
It is clean, it is then placed into two reeded jackets of tool, then two reeded jackets of tool is welded, are obtained with packet
The TiAl alloy slab of set；
The jacket with a thickness of 5mm-20mm；The jacket material is stainless steel, heat resisting steel or carbon steel.
7. the method according to claim 5 for directly preparing fine grain synusia tissue T iAl sheet alloy, which is characterized in that step
In rapid C, the design parameter of pack rolling early period include: rolling temperature be 1255 DEG C -1360 DEG C, stokehold keeps the temperature 10min-
It is 5min- that 40min, mill speed 20mm/s-120mm/s, pass deformation 18%-40%, passage, which melt down soaking time,
12min, overall reduction 40%-70%；
In step D, the design parameter of the later period pack rolling includes: that rolling temperature keeps the temperature for 1255 DEG C -1360 DEG C, stokehold
2min-10min, mill speed 50mm/s-200mm/s, pass deformation 15%-35%, passage melt down soaking time and are
2min-10min, overall reduction 60%-90%.
8. the method according to claim 7 for directly preparing fine grain synusia tissue T iAl sheet alloy, which is characterized in that institute
The design parameter for stating pack rolling early period includes: that rolling temperature is 1260 DEG C -1350 DEG C, stokehold heat preservation 10min-30min, rolls
Speed is 30mm/s-60mm/s, to melt down soaking time be 5min-10min, under stagnation pressure for pass deformation 25%-35%, passage
Amount is 45%-65%；
The design parameter of the later period pack rolling include: rolling temperature be 1260 DEG C -1345 DEG C, stokehold keep the temperature 8min-
It is 4min- that 12min, mill speed 50mm/s-100mm/s, pass deformation 20%-25%, passage, which melt down soaking time,
8min, overall reduction 70%-85%.
9. the method according to claim 5 for directly preparing fine grain synusia tissue T iAl sheet alloy, which is characterized in that step
In rapid E, the condition of the annealing are as follows: by the condition for being 800 DEG C -900 DEG C in temperature through step D treated TiAl alloy slab
Lower heat preservation 6h-48h, then cools to room temperature with the furnace.
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| CN110438369A (en) * | 2019-09-18 | 2019-11-12 | 大连大学 | A kind of high rigidity, the preparation method of high oxidative Ti-Al-Nb-Re alloy |
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| CN113528891A (en) * | 2020-04-16 | 2021-10-22 | 中国科学院金属研究所 | Deformed TiAl alloy material capable of realizing low-cost rolling |
| CN114150242A (en) * | 2021-11-25 | 2022-03-08 | 南京理工大学 | Method for inhibiting coarsening of light high-strength TiAl alloy lamella |
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| CN112251643A (en) * | 2020-09-29 | 2021-01-22 | 中国科学院金属研究所 | High-thermal-stability equiaxial nanocrystalline Ti6Al4V-Mn alloy and preparation method thereof |
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| CN114150242B (en) * | 2021-11-25 | 2023-07-18 | 南京理工大学 | Method for inhibiting coarsening of light high-strength TiAl alloy sheet |
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